| 摘要 |
PROBLEM TO BE SOLVED: To improve brightness of a screen, without deteriorating self-color tolerance and other colors tolerance in the case of mislanding on a fluorescent screen by disposing apertures and phosphor dots having hexagonal shape in the same direction. SOLUTION: When a condition such that apertures of a shadow mask is formed in hexagons, shapes of phosphor dots 21 and electron beam spots 5 formed on a fluorescent screen 4 are also formed in hexagonal shape similar to each other. For example, opposite side distances of the phosphor dots 21 and electron beam spots 5 are respectively set as (b)=100μm, and (c)=140μm. When the distance between each neighboring phosphor dot is the same pitch of 150μm, and the self-color tolerance is 20μm, and other color tolerance is a minimum distance (d)=30μm. When the condition that numbers and pitches of apertures and phosphor dots 21 are set the same as the case of the regular hexagon shape and the shapes are formed in a hexagonal shape which is longer m a Y-axis direction, the other colors tolerance is unified in all directions, and thereby values of (d) and (e) are equalized. Accordingly, a brightness is improved by reducing a ratio of a black matrix.
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